How to use a placeholder with an NSString

Question

I am currently using this code to put some text on the screen

   userOutput.text=@"";

I want to be able to display an int variable in the string, like you do with printf in C with the %d placeholders. How do I do this with an NSString

Answer 1

int whatever = 42;
userOutput.text = [NSString stringWithFormat:@"%d", whatever];

Answer 2

use NSString's +stringWithFormat: method:

 userOutput.text= [NSString stringWithFormat: @"%d", 100];

It uses exactly the same format specifiers as printf function in c.